Diodes Incorporated MMBZ5228BW-7-F

Overview

MMBZ5228BW-7-F from Diodes Incorporated is a 3.9 V, 200 mW surface-mount Zener diode in SOT323 package, rated for ±5% zener voltage tolerance at 20 mA test current, with 23 Ω maximum zener impedance and 10 μA reverse leakage at 1.0 V, used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces.

For engineers reviewing the MMBZ5228BW-7-F datasheet, MMBZ5228BW-7-F pinout, MMBZ5228BW-7-F application, or MMBZ5228BW-7-F equivalent, key selection criteria include nominal zener voltage (3.9 V), power dissipation (200 mW), zener impedance (23 Ω), thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. It delivers 3.9 V regulation with 3.71–4.10 V min/max range at 20 mA, and exhibits low dynamic impedance (23 Ω @ 1 kHz) for minimal output variation during transient current changes.

Designed for high-reliability applications, it meets AEC-Q101 stress testing requirements and features halogen- and antimony-free "Green" molding compound compliant with RoHS 2 (2011/65/EU). Its SOT323 package supports automated assembly and achieves 625 °C/W junction-to-ambient thermal resistance on FR4 PCBs with recommended pad layout.

Key Specifications

Pinout & Package

Package: SOT323 - 3-terminal plastic surface-mount package with 0.65 mm lead pitch, 2.10 mm × 1.30 mm body size, and 0.30 mm typical height; optimized for high-density PCB layouts and reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with BZX84-C3V9 and MMSZ5228ET1G, MMBZ5228BW-7-F uniquely balances automotive-grade reliability (AEC-Q101), compact SOT323 form factor, and tight 23 Ω zener impedance-making it optimal for space-constrained, safety-critical voltage references where long-term parametric stability matters.

Availability

MMBZ5228BW-7-F is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial analog input modules, and medical wearable battery monitoring requiring stable component supply and AEC-Q101-compliant performance.

Supply support for MMBZ5228BW-7-F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets with ISO/TS 16949 and IATF 16949 certification.

The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for precision voltage referencing and overvoltage protection in harsh-environment electronics where long-term parametric stability and process consistency are mandatory.

FAQ

What is the maximum continuous reverse current this Zener can handle at 3.9 V?

At 3.9 V, the absolute maximum continuous reverse current is calculated from its 200 mW power rating: I_ZMAX = 200 mW / 3.9 V ≈ 51.3 mA. Operation above this current risks thermal runaway unless board-level heatsinking reduces R_θJA below 625 °C/W.

Does this part support reflow soldering per JEDEC J-STD-020?

Yes - MMBZ5228BW-7-F has Moisture Sensitivity Level 1 per J-STD-020D, meaning it may be stored indefinitely at ≤30°C/85% RH and withstand standard Pb-free reflow profiles (peak 260°C) without baking or special handling.

How does its zener impedance affect voltage regulation accuracy under dynamic load?

With 23 Ω maximum zener impedance, a 10 mA step change in reverse current causes ≤0.23 V output shift (ΔV = I × Z_Z). This enables stable regulation in sensor bias networks where load current varies slowly, but not in high-frequency switching applications.

Is the cathode pin electrically isolated from the thermal pad in SOT323?

No - in the SOT323 package, Pin 3 (thermal pad) is internally bonded to the cathode (Pin 2); both pins must be connected to the same net, typically the regulated output or ground return path, to ensure proper thermal conduction and electrical function.